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A novel halophilic actinomycete strain, H23^T, was isolated from a Saharan soil sample collected in Djamâa (Oued Righ region), El-Oued province, South Algeria. Strain H23^T was identified as a member of the genus Actinopolyspora by a polyphasic approach. Phylogenetic analysis showed that strain H23^T had 16S rRNA gene sequence similarities ranging from 97.8 % (Actinopolyspora xinjiangensis TRM 40136^T) to 94.8 % (Actinopolyspora mortivallis DSM 44261^T). The strain grew optimally at pH 6.0–7.0, 28–32 °C and in the presence of 15–25 % (w/v) NaCl. The substrate mycelium was well developed and fragmented with age. The aerial mycelium produced long, straight or flexuous spore chains with non-motile, smooth-surfaced and rod-shaped spores. Strain H23^T had MK-10 (H₄) and MK-9 (H₄) as the predominant menaquinones. The whole micro-organism hydrolysates mainly consisted of meso …